Hm well here you go. I didn't know enough about the beyers to make a good comparison.
For time of comfort wearing the V-MODA's you can expect about 4 hours before they start to hurt your ears just because the cups are shallow. But this can be solved easily by taking a break using them, which you should actually do anyway to save your hearing from the continual noise. otherwise these headphones wrap around your head really comfortably.
I agree with what those people said in the link about the bass in the V-MODA's. Comparing to the AD-700 you might not like the vocals as much, but I feel like the V-MODA have a sound that is less fatiguing. Makes sense since they are made as DJ headphones. It takes some time for the vocals to clear up after using them for many hours.
I would like someone to have some input on the Ultrasone Pro 550s...although I've heard that while the ultrasones are great for EDM music because of the bass, the vocals and acoustics don't sound very natural.
As for openness, yes the V-MODA feel more closed, but I have no trouble using them in FPS games to detect sound direction.
Perhaps you might prefer the DT 770 because of this although I dont know if they would be as good without an added amp which you would have to spend more money on since your sound card does not have a more powerful amp. I would suggest these if you want more bass, but do not want to sacrifice other things from your ad 700. Some people says beyers are more fatiguing though. I don't know how true this is. But they are audiophile headphones so I guess that's just how it is.
Here's how it is to me. When I have enough money, I would love to buy the Audio Technica ATH-900X because of the clearer vocals and greater openness. Mostly just for gaming and sometimes to listen to other music when I'm in the mood. Well perhaps after I get the V-MODA M-100s lol. But the bass is very lacking on the 900X just like the other gaming headphones I used to use. It doesn't feel full, and definitely
does not go as low and rumbling as the V-MODAs do.